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MPEGs of our Seismology Work


The following MPEGs document the Los Alamos/SMU mine blasting experiments in 1995 and 1996 as described in the report entitled "Reducing the Ambiguity and Visibility of Seismic Signals from Mining Activities." For a copy of this report, more MPEGs, and PDF documents related to our research, please visit our academic collaborator, David Anderson, at SMU.

Click on each thumbnail to view the video.

16 June 1995 - This MPEG taken from within the pit of the coal mine is of a large cast blast. Video of the explosion has been deinterlaced and time tagged. (1.5 MB)

16 June 1995 - Waveforms Observed ground motions and a model of the blast (turns from white to red at design shot time) have been superimposed and time correlated with the video images of the explosion. (2.4 MB)

16 June 1995 Model - A model depicting the generation and propagation of the compressional energy resulting from the detonation of each of the individual borehole in the 16 June explosion. The design shot times of the explosion were used to create the visualization. (2.0 MB)

13 November 1995 - This MPEG movie taken from within the pit of the coal mine is of a large cast blast. Video of the explosion has been deinterlaced and time tagged. (2.3 MB)

13 November 1995 Waveforms - Observed ground motions and acoustic waveforms and a model of the blast (turns from white to red at design shot time) have been superimposed and time correlated with the video images of the explosion. Note the large peak amplitude at late time in the ground motions which is reflective of the simultaneous detonation of several boreholes towards the end of the shot. (4.1 MB)

13 November 1995 Model - A model depicting the generation and propagation of the compressional energy resulting from the detonation of each of the individual borehole in the 13 Nov explosion. The simultaneous detonation of several boreholes at the end of the shot is depicted. (2.0 MB)

11 March 1995 Spoils - This MPEG movie taken from the spoils pile overlooking the pit is of a large cast blast. Video of the explosion has been deinterlaced and time tagged. (3.1 MB)

01 August 1996 - This MPEG movie taken from the spoils pile overlooking the pit is of a large cast blast. Video of the explosion has been deinterlaced and time tagged. (1.9 MB)

Primary and Auxiliary Seismic Stations - This MPEG movie represents the Primary and Auxiliary seismic stations proposed as part of the International Monitoring System for the Comprehensive Test Ban Treaty. As the globe turns the model zooms into a mine in NE Wyoming where video from a large explosion is played. Explosions such as this one may produce seismic signals that will be detected by some of the seismic stations in the International Monitoring System. (2.2 MB)

The Tyrnyauz Blast - These images document mining practices in a moly mine of the former Soviet Union in Tyrnyauz, Georgia. This blast used bore holes approximately 12 inches in diameter and 36 feet deep loaded with ANFO explosive. The holes were not stemmed (backfilled) and thus produced huge airblasts. (.4 MB)

Tyrnyauz Blast Model - This model simulates a 500 frames per second slow motion film of the Tyrnyauz moly mine blast, including the row-by-row delay times and the sequential firing of the explosive charges. The blue rings represent the seismic wavefronts moving out at about 3000 meters per second. The yellow rings represent the accompanying slower airblasts. (.5 MB)

Multi-Shot Experiment - American open-pit coal mine blasting. This experiment studied a small 4x4 array shot which was heavily instrumented both at close range and regional distances. Velocity gauges and accelerometers as well as velocity-of-detonation recorders (VODR) and hi-speed film and video cameras were used to form combined data sets used to quantify seismic source processes. This is not really a movie, just 6 stills in MPEG format. (550K)

Multi-Shot Blast - Digitized video has been de-interlaced and de-jittered to produce half-speed images of the blast. This then is combined with ground motion data collected from 3-axis accelerometers installed near the camera locations. Note the coupling (or lack) of the ripple fired charges as they go off in sequence. Note also how little seismic energy is generated from the re-impacting of the lofted material. (470K)

Multi-Shot Model - The ground motions and detonation timing are combined in this computer model of the multiple shot sequence. Three axis ground motion waveforms are displayed with a moving cursor for temporal reference. Timing delays deviate from those designed by the blaster as documented by down-hole VODR and hi-speed film analysis. (520K)

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